Typical applications for maraging include missile and rocket motor cases, landing and takeoff gear, munitions, aerospace, extrusion tooling, die casting, high performance shafting, gears and fasteners.
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | - | 0.03 | ||
| Si | - | 0.10 | ||
| Mn | - | 0.10 | ||
| P | - | 0.010 | ||
| S | - | 0.010 | ||
| Cr | - | 0.50 | ||
| Ni | 18.00 | 19.00 | ||
| Mo | 4.60 | 5.20 | ||
| Cu | - | 0.50 | ||
| Co | 8.50 | 9.50 | ||
| Al | 0.05 | 0.15 | ||
| Ti | 0.50 | 0.80 | ||
| Fe | - | Bal |
MARAGING (C) 300
General: Maraging is a 18% nickel, cobalt strengthened steel (C-type), with excellent mechanical properties, workability and heat
treatment characteristics.
Applications: Typical applications for maraging include missile and rocket motor cases, landing and takeoff gear, munitions,
aerospace, extrusion tooling, die casting, high performance shafting, gears and fasteners.
Composition:
C Mn Si P S NI
0.03 max 0.10 max 0.10 max 0.010 max 0.010 max 18.00-19.00
Co Mo Ti Al Cr Cu
8.50-9.50 4.60-5.20 0.50 -0.80 0.05-0.15 0.50 max 0.50 max Fe Bal
Material Melt Method: Maraging melt method is a VIM (Vacuum Induction Melt) + VAR (Vacuum Arc Remelt)
As Shipped Condition: Maraging is supplied in the annealed and descaled condition. The alloy is very tough, relatively soft (36
Rc Max.), therefore, readily machined and formed.
*Bar Tolerances: .250” - .499” .500” - .999” 1.000” – 3.625” 3.626” – 6.000” 6.001” – 8.000” 8.001” – 10.000”
-.000/+.005 -.000/+.010 -.000/+.031 -.000/+.047 -.000/+.063 -.000/+0.078
Minimum Properties after Aging:
Hardness ……………… 52 Rc Charpy V-notch ……… 12 ft/lbs. min Reduction of Area ……. 47%
Elongation ……………. 5.0% Yield Strength …………. 280 ksi Fracture Toughness ….. 60
Physical Properties:
Density………………………………… .289 lbs./cu. In
Average Coefficient of Thermal Expansion (70 – 900 F) ……………… 5.6 x 10 -6 in/in. F
Heat Treatment Aging Process: (Non Die Casting Applications)
Material is to be heat treated to 900 F +/- 10 holding at temperature for 6 hours then cooling at room air temperature. During the aging
treatment maraging shrinks uniformly and predictably on all dimensions .001 in/in
Heat Treatment Aging Process: (Die Casting Applications)
Following the rough machining of the die, anneal at 1500-1525 F for 1 hour per inch of thickness is recommended. After finish
machining , an aging heat treatment of 980-1000 F for 6 hours is recommended.
Machining:
Maraging steel in the annealed condition is comparable to 4340. However, when maraging is aged, the type of cutting tool and speeds
change. Rigid equipment, firm tool supports, sharp tools and abundant coolant are essential.
Welding:
Maraging is weld able without preheat, in both the annealed and aged condition. Only an aging heat treatment is needed to restore in the
weld.
Standards:
AMS 6514 ASTM A 538 *Mil-S-46850D UNS K93120
*DMI product is not supplied to the dimensional tolerances of MIL-S-46850D.
*The information, data and specifications presented here are representative only, and are not guaranteed values. Material or products
applications described are solely for illustrative purposes and should not be construed as express or implied warranties for fitness for these
or other applications
| Proof strength Rp0.2 (MPa) |
Tensile strength Rm (MPa) |
Impact energy KV (J) |
Elongation at fracture A (%) |
Reduction in cross section on fracture Z (%) |
As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 788 (≥) | 342 (≥) | 42 | 34 | 13 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 123 |
| Property | Density kg/dm3 |
Temperature T °C/F |
Specific heat J / kgK |
Thermal conductivity W/mK |
Electric resistance µΩ·cm |
Modulus of elasticity kN/mm2 |
Expansion rate |
|---|---|---|---|---|---|---|---|
| 456 (≥) | 594 (≥) | 21 | 42 | 22 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 133 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 679 | 545 | 871 |
We can customize the production of 18Ni Maraging Steel grade, contact us for the best solution.
–sales@specificsteel.com